What, where, when??

The Global Centre for Rail Excellence (GCRE) will become Europe’s leading rail innovation centre, providing world class research, testing and certification of rolling stock, infrastructure and innovative new rail technologies.

The facility will include:

electrified high-speed outer rail testing track (6.9km) with testing speeds of potentially up to 125mph
electrified low-speed infrastructure testing track (4km) allowing speeds of up to 40mph
dual platform station environment
25kv overhead line equipment (OLE) infrastructure

The site is located at the Nant Helen surface mine and Onllwyn coal washery at the head of the Dulais and Tawe valleys.

Public consultation: summer 2019 and autumn 2020
Planning application submission: spring 2021
Planning approval: summer 2021
Construction begins: early 2023
First commercial facilities open: summer 2023 (storage facilities on site)
Track construction begins: 2024
Fully operational: summer 2025

Obviously "Global" is one of those new Welsh language place names - what was it in English?

I read about this place a while back.  From what I can see online, work on the ground has already started. 
It does seem to have its critics who question it's use to the rail industry in the UK as it isn't located particularly closely to any of the major rolling stock assembly centres.  It does however have a link to the national rail network, is close to Swansea docks and will have viable road access through the upgrade of the Head of the Valleys A Road. 
They also seem to have European railway companies in their sights as potential customers.
I think that I might try and follow this a bit more.

[b'The railway lines and station in the middle of nowhere no real passengers will probably ever travel on[/b]

A £400m Global Centre of Rail Excellence facility is being built on an old opencast site, and it's pretty unique

On the mountains of Neath Port Talbot there's a unique and large-scale development starting to take shape that could have a massive impact on the area.

It will eventually feature miles of railway tracks and station platforms, but no real passengers will likely ever travel on it, or stand at the station platforms waiting for a train.

Located on 700 hectares of land near the village of Onllwyn, 17 miles north of Neath, and straddling the neighbouring borough of Powys, a new £400 million rail testing centre named The Global Centre of Rail Excellence, is currently being developed.

.....but no real passengers will likely ever travel on it, or stand at the station platforms waiting for a train.

Global Centre of Rail Excellence: £400m rail testing facility 'delayed for five years'

A state of the art rail testing facility near Ystradgynlais is at least five years behind schedule, it has been revealed.

On Friday, Powys County Council councillors received a report outlining the risks to the council associated with transforming the former Nant Helen opencast mine and Onllwyn washery site into a Global Centre of Railway Excellence (GCRE).

The development has a potential to create hundreds of jobs and could revitalise the economy bringing in an estimated £300 million into the area.

Article continues

From ITV.com

Next steps

GCRE has begun the next phase of plans to bring private sector investment into the company, GCRE Ltd. It has formally launched a public procurement process, with the publication of a Contract Notice and Selection Questionnaire inviting applicants to pre-qualify.

The public procurement process is expected to run until the autumn of 2023. Following this it is expected that GCRE Ltd will become majority owned by a private investor(s).

t

That could easily take four years to get nowhere, couldn't it? Just ask Go-Op how!